Earth’s water may have been inherited from material similar to enstatite chondrite meteorites | Zendy

Laurette Piani | Zendy; Yves Marrocchi | Zendy; Thomas Rigaudier | Zendy; Lionel G. Vacher | Zendy; Dorian Thomassin | Zendy; Bernard Marty | Zendy

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Earth’s water may have been inherited from material similar to enstatite chondrite meteorites

Author(s) -

Laurette Piani,

Yves Marrocchi,

Thomas Rigaudier,

Lionel G. Vacher,

Dorian Thomassin,

Bernard Marty

Publication year - 2020

Publication title -

science

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 12.556

H-Index - 1186

eISSN - 1095-9203

pISSN - 0036-8075

DOI - 10.1126/science.aba1948

Subject(s) - enstatite , meteorite , chondrite , astrobiology , earth (classical element) , carbonaceous chondrite , mantle (geology) , achondrite , geology , crust , parent body , geochemistry , formation and evolution of the solar system , early earth , mineralogy , physics , astronomy

An unexpected source of Earth's water The abundances of Earth's chemical elements and their isotopic ratios can indicate which materials formed Earth. Enstatite chondrite (EC) meteorites provide a good isotopic match for many elements but are expected to contain no water because they formed in the hot inner Solar System. This would require Earth's water to be from a different source, such as comets. Pianiet al. measured hydrogen contents and deuterium/hydrogen ratios (D/H) in 13 EC meteorites (see the Perspective by Peslier). They found far more hydrogen than is commonly assumed, with D/H close to that of Earth's mantle. Combining these data with cosmochemical models, they show that most of Earth's water could have formed from hydrogen delivered by EC meteorites.Science , this issue p.1110 ; see also p.1058

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